10
10.0
Apr 8, 2015
04/15
Apr 8, 2015
by
S. AraujoBetancor; B. T. Gaensicke; K. S. Long; K. Beuermann; D. de Martino; E. M. Sion; P. Szkody
10
0
1
We have obtained HST/STIS data for a total of eleven polars as part of a program aimed to compile a homogeneous database of highquality farultraviolet (FUV) spectra for a large number of cataclysmic variables (CVs). Of the eleven polars, eight were found in a state of low accretion activity (V347Pav, VVPup, V834Cen, BLHyi, MRSer, STLMi, RXJ1554.2+2721 and V895Cen) and three in a state of high activity (CDInd, ANUMa and UWPic). The STIS spectra of the lowstate polars unambiguously reveal the...
( 1 reviews )
Source: http://arxiv.org/abs/astroph/0412180v1
13
13
Apr 8, 2015
04/15
Apr 8, 2015
by
Michael L. Sitko; Lawrence S. Bernstein; Robert J. Glinski
13
0
1
We have reanalyzed the ultraviolet spectrum of HD 44179, the central star(s) of the Red Rectangle nebula, providing improved estimates of the column density, rotational, and vibrational temperatures of the 4th Positive AX system of CO in absorption. The flux shortward of 2200 A is a complex blend of CO features with no discernible stellar photosphere, making the identification of other molecular species difficult, and the direct derivation of the dust extinction curve impossible. We confirm...
( 1 reviews )
Source: http://arxiv.org/abs/0802.2085v1
31
31
Mar 15, 2015
03/15
Mar 15, 2015
by
Mikhail I. Rabinovich; Mehmet K. Muezzinoglu
31
0
1
We present a new paradigm in the study of brain mental dynamics on the basis of the stable transient activity neural networks observed in experiments. This new approach is in contrast to traditional system analysis usually adopted in cognitive modeling. Transient dynamics offers a sound formalism of the observed qualities of brain activity, while providing a rigorous set of analysis tools. Transients have two main features: First, they are resistant to noise, and reliable even in the face of...
( 1 reviews )
Source: http://arxiv.org/abs/0909.1144v1
28
28
Jan 26, 2015
01/15
Jan 26, 2015
by
Arkaitz Zubiaga; Damiano Spina; Enrique Amigó; Julio Gonzalo
28
0
1
This paper explores the realtime summarization of scheduled events such as soccer games from torrential flows of Twitter streams. We propose and evaluate an approach that substantially shrinks the stream of tweets in realtime, and consists of two steps: (i) subevent detection, which determines if something new has occurred, and (ii) tweet selection, which picks a representative tweet to describe each subevent. We compare the summaries generated in three languages for all the soccer games in...
( 1 reviews )
Source: http://arxiv.org/abs/1204.3731v1
93
93
Mar 28, 2014
03/14
Mar 28, 2014
by
J. L. F. Barbon
93
1
1
This is a rendering of a review talk on the state of String Theory, given at the EPS2003 Conference, intended for a wide audience of experimental and theoretical physicists. It emphasizes general ideas rather than technical aspects.
( 1 reviews )
Source: http://arxiv.org/abs/hepth/0404188v1
56
56
Mar 2, 2014
03/14
Mar 2, 2014
by
Roman Sverdlov
56
0
1
The first goal of this paper is to show that discreteness, locality, and relativistic covariance can peacefully coexist if the ordinary spacetime (OST) is replaced with phase spacetime (PST) as a geometric background of a Poisson process, where PST is a spacetime generalization of a notion of phase space (this is a 7dimensional version of the 8dimensional structure proposed by Caianiello). Furthermore, Caianiello's idea of finite acceleration is implemented. After this is done, the paper then...
( 1 reviews )
Source: http://arxiv.org/abs/0910.2498v3
40
40
Nov 7, 2013
11/13
Nov 7, 2013
by
Andrei A. Galiautdinov; David R. Finkelstein
40
0
1
The Dirac equation is not semisimple. We therefore regard it as a contraction of a simpler decontracted theory. The decontracted theory is necessarily purely algebraic and nonlocal. In one simple model the algebra is a Clifford algebra with 6N generators. The quantum imaginary $\hbar i$ is the contraction of a dynamical variable whose backreaction provides the Dirac mass. The simplified Dirac equation is exactly Lorentz invariant but its symmetry group is SO(3,3), a decontraction of the...
( 1 reviews )
Source: http://arxiv.org/abs/hepth/0106273v2
2
2.0



by
C. C. Chang; J. M. Nester; C. M. Chen
2
0
0
Early energymomentum investigations for gravitating systems gave reference frame dependent pseudotensors; later the quasilocal idea was developed. Quasilocal energymomentum can be determined by the Hamiltonian boundary term, which also identifies the variables to be held fixed on the boundary. We show that a pseudotensor corresponds to a Hamiltonian boundary term. Hence they are quasilocal and acceptable; each is the energymomentum density for a definite physical situation with certain...
Source: http://arxiv.org/abs/grqc/9809040v2
3
3.0



by
Jon Olav Grepstad; Johannes Skaar
3
0
0
Total internal reflection occurs for large angles of incidence, when light is incident from a highrefractiveindex medium onto a lowindex medium. We consider the situation where the lowindex medium is active. By invoking causality in its most fundamental form, we argue that evanescent gain may or may not appear, depending on the analytic and global properties of the permittivity function. For conventional, weak gain media, we show that there is an absolute instability associated with...
Source: http://arxiv.org/abs/1009.4592v3
The stochastic quantization of dissipative systems is discussed. It is shown that in order to stochastically quantize a system with dissipation, one has to restrict the Fourier transform of the spacetime variable to the positive half domain in the complex plane. This breaks the timereversal invariance, which manifests in the formulation through the resulting noninvariant forms for the propagators. The relation of the stochastic approach with the Caldeira and Leggett pathintegral method is...
Source: http://arxiv.org/abs/hepth/9404167v1
6
6.0



by
Sabine Reffert; Andreas Quirrenbach; David S. Mitchell; Simon Albrecht; Saskia Hekker; Debra A. Fischer; Geoffrey W. Marcy; R. Paul Butler
6
0
0
It has long been speculated that the observed periodic radial velocity pattern for the K giant Pollux might be explained in terms of an orbiting planetary companion. We have collected 80 highresolution spectra for Pollux at Lick Observatory yielding precise radial velocities with a mean error of 3.8 m/s, providing the most comprehensive and precise data set available for this star. Our data confirm the periodicity previously seen in the radial velocities. We derive a period of 589.7+/3.5 days...
Source: http://arxiv.org/abs/astroph/0607136v1
In this paper we make two observations related to discrete torsion. First, we observe that an old obscure degree of freedom (momentum/translation shifts) in (symmetric) string orbifolds is related to discrete torsion. We point out how our previous derivation of discrete torsion from orbifold group actions on B fields includes these momentum lattice shift phases, and discuss how they are realized in terms of orbifold group actions on Dbranes. Second, we describe the M theory dual of IIA...
Source: http://arxiv.org/abs/hepth/0302152v2
5
5.0



by
Winfried Bruns; Tim Roemer
5
0
0
We show that the Ehrhart hvector of an integer Gorenstein polytope with a regular unimodular triangulation satisfies McMullen's gtheorem; in particular, it is unimodal. This result generalizes a recent theorem of Athanasiadis (conjectured by Stanley) for compressed polytopes. It is derived from a more general theorem on Gorenstein affine normal monoids M: one can factor K[M] (K a field) by a "long" regular sequence in such a way that the quotient is still a normal affine monoid...
Source: http://arxiv.org/abs/math/0508392v2
3
3.0



by
Youngshin Kwon; Massimiliano Procura; Wolfram Weise
3
0
0
An updated investigation of QCD sum rules for the first two moments of rho meson spectral functions, both in vacuum and inmedium, is performed with emphasis on the role of the scale related to spontaneous chiral symmetry breaking in QCD. It is demonstrated that these lowest moments of vector current spectral distributions do permit an accurate sum rule analysis with controlled input including QCD condensates of the lowest dimensions, whereas higher moments are subject to uncertainties from...
Source: http://arxiv.org/abs/0803.3262v3
5
5.0



by
W. Cassing; E. L. Bratkovskaya; U. Mosel; S. Teis; A. Sibirtsev
5
0
0
We analyse the production and propagation of kaons and antikaons in Ni + Ni reactions from 0.81.85 GeV/u within a coupled channel transport approach including the channels $BB \to K^+YN, \pi B\to K^+Y, BB \to NN K \bar{K}, \pi B\to N K\bar{K}, K^+B\to K^+B, \bar{K} B\to \bar{K}B, Y N\to \bar{K} NN, \pi \pi\to K \bar{K}$ as well as $\pi Y\to \bar{K}N$ and $\bar{K} N\to \pi Y$ for the antikaon absorption. Whereas the experimental $K^+$ spectra can be reproduced without introducing any...
Source: http://arxiv.org/abs/nuclth/9609050v1
An empirical method for correcting lowresolution astronomical spectra for secondorder contamination is presented. The method was developed for correcting spectra obtained with grism #4 of the ALFOSC spectrograph at the Nordic Optical Telescope and the performance is demonstrated on spectra of two nearby bright Type Ia supernovae.
Source: http://arxiv.org/abs/0705.3441v1
8
8.0



by
Sabyasachi Roy; D. K. Choudhury
8
0
0
NambuGoto action of bosonic string predicts the quarkantiquark potential to be $ V (r) = \frac{\gamma}{r} + \sigma r +\mu_0 $. The coefficient$ \gamma =  \frac{\pi(d2)}{24} $ is the universal L\"{u}scher coefficient of the L\"uscher term $ \frac{\gamma}{r}$, which depends upon the spacetime dimension `d'. We take linear term in potential as parent and L\"uscher term as perturbation for the generation of wave function for meson in d spacetime dimension.The wave function...
Source: http://arxiv.org/abs/1301.0982v2
4
4.0



by
T. M. Aliev; A. Ozpineci; M. Savci; C. Yuce
4
0
0
Using the most general, model independent form of effective Hamiltonian, the transverse polarization P_T of Lambda in Lambda_b > Lambda l^+ l^ decay is studied. It is observed that the averaged is very sensitive to the existence of new physics and can attain large values, which can be measured at future colliders.
Source: http://arxiv.org/abs/hepph/0206014v1
6
6.0



by
J. T. Chalker; D. G. Polyakov; F. Evers; A. D. Mirlin; P. Woelfle
6
0
0
We discuss the behaviour of a quantum Hall system when two Landau levels with opposite spin and combined filling factor near unity are brought into energetic coincidence using an inplane component of magnetic field. We focus on the interpretation of recent experiments under these conditions [Zeitler et al, Phys. Rev. Lett. 86, 866 (2001); Pan et al, Phys. Rev. B 64, 121305 (2001)], in which a large resistance anisotropy develops at low temperatures. Modelling the systems involved as Ising...
Source: http://arxiv.org/abs/condmat/0208024v1
10
10.0



by
J. Bakosi; J. R. Ristorcelli
10
0
0
The method of potential solutions of FokkerPlanck equations is used to develop a transport equation for the joint probability of N coupled stochastic variables with the Dirichlet distribution as its asymptotic solution. To ensure a bounded sample space, a coupled nonlinear diffusion process is required: the Wienerprocesses in the equivalent system of stochastic differential equations are multiplicative with coefficients dependent on all the stochastic variables. Individual samples of a...
Source: http://arxiv.org/abs/1303.0217v2
8
8.0



by
M. Xu; Y. F. Huang
8
0
0
Early rebrightenings at a postburst time of 10^2  10^4 s have been observed in the afterglows of some gammaray bursts (GRBs). Unlike Xray flares, these rebrightenings usually last for a relatively long period. The continuous energy injection mechanism usually can only produce a plateau in the afterglow light curve, but not a rebrightening. Also, a sudden energy injection can give birth to a rebrightening, but the rebrightening is a bit too rapid. Here we argued that the early rebrightenings...
Source: http://arxiv.org/abs/1008.1686v1
14
14



by
HsiaoWen Chen; P. J. McCarthy; R. O. Marzke; J. Wilson; R. G. Carlberg; A. E. Firth; S. E. Persson; C. N. Sabbey; J. R. Lewis; R. G. McMahon; O. Lahav; R. S. Ellis; P. Martini; R. G. Abraham; A. Oemler; D. C. Murphy; R. S. Somerville; M. G. Beckett; C. D. Mackay
14
0
0
(Abridged) The Las Campanas Infrared Survey, based on broadband optical and nearinfrared photometry, is designed to robustly identify a statistically significant and representative sample of evolved galaxies at redshifts z>1. We have completed an Hband imaging survey over 1.1 square degrees of sky in six separate fields. The average 5 sigma detection limit in a four arcsecond diameter aperture is H ~ 20. Here we describe the design of the survey, the observation strategies, data reduction...
Source: http://arxiv.org/abs/astroph/0108171v2
18
18



by
Thierry Barbot; Sergio Fenley
18
0
0
We first prove rigidity results for pseudoAnosov flows in prototypes of toroidal 3manifolds: we show that a pseudoAnosov flow in a Seifert fibered manifold is up to finite covers topologically equivalent to a geodesic flow and we show that a pseudoAnosov flow in a solv manifold is topologically equivalent to a suspension Anosov flow. Then we study the interaction of a general pseudoAnosov flow with possible Seifert fibered pieces in the torus decomposition: if the fiber is associated with...
Source: http://arxiv.org/abs/1007.0578v2
12
12



by
G. Bordyugov; A. Pikovsky; M. Rosenblum
12
0
0
We report on a selfemerging chimera state in a homogeneous chain of nonlocally and nonlinearly coupled oscillators. This chimera, i.e. a state with coexisting regions of complete and partial synchrony, emerges via a supercritical bifurcation from a homogeneous state and thus does not require preparation of special initial conditions. We develop a theory of chimera basing on the equations for the local complex order parameter in the OttAntonsen approximation. Applying a numerical linear...
Source: http://arxiv.org/abs/1003.0589v3
7
7.0



by
Goulnara Arzhantseva; Liviu Paunescu
7
0
0
We introduce and systematically study linear sofic groups and linear sofic algebras. This generalizes amenable and LEF groups and algebras. We prove that a group is linear sofic if and only if its group algebra is linear sofic. We show that linear soficity for groups is a priori weaker than soficity but stronger than weak soficity. We also provide an alternative proof of a result of Elek and Szabo which states that sofic groups satisfy Kaplansky's direct finiteness conjecture.
Source: http://arxiv.org/abs/1212.6780v1
We show that the inverse limit of the graded algebras of local unitary invariant polynomials of finite dimensional kpartite quantum systems is free, and give an algebraically independent generating set. The number of degree 2d invariants in the generating set is equal to the number of conjugacy classes of index d subgroups of a free group on k1 generators.
Source: http://arxiv.org/abs/1102.2861v1
11
11



by
Magdalena Zielenkiewicz
11
0
0
Using the BerlineVergne integration formula for equivariant cohomology for torus actions, we prove that integrals over Grassmannians (classical, Lagrangian or orthogonal ones) of characteristic classes of the tautological bundle, can be expressed as iterated residues at infinity of some holomorphic functions of several variables. The results obtained for these cases, can be expressed as special cases of one formula, involving the Weyl group action on the characters of the natural...
Source: http://arxiv.org/abs/1212.6623v1
5
5.0



by
Molly E. C. Swanson
5
0
0
Particles have tremendous potential as astronomical messengers, and conversely, studying the universe as a whole also teaches us about particle physics. This thesis encompasses both of these research directions. Many models predict a diffuse flux of high energy neutrinos from active galactic nuclei and other astrophysical sources. The "Astrophysics Underground" portion of this thesis describes a search for this neutrino flux performed by looking for very high energy upwardgoing muons...
Source: http://arxiv.org/abs/0808.0002v1
15
15



by
J. Maciejko; B. Hsu; S. A. Kivelson; YeJe Park; S. L. Sondhi
15
0
0
The topological physics of quantum Hall states is efficiently encoded in purely topological quantum field theories of the ChernSimons type. The reliable inclusion of lowenergy dynamical properties in a continuum description however typically requires proximity to a quantum critical point. We construct a field theory that describes the quantum transition from an isotropic to a nematic Laughlin liquid. The soft mode associated with this transition approached from the isotropic side is...
Source: http://arxiv.org/abs/1303.3041v3
4
4.0



by
Kiwamu Izumi; Koji Arai; Bryan Barr; Joseph Betzwieser; Aidan Brooks; Katrin Dahl; Suresh Doravari; Jennifer C. Driggers; W. Zach Korth; Haixing Miao; Jameson Rollins; Stephen Vass; David YeatonMassey; Rana X. Adhikari
4
0
0
Long baseline laser interferometers used for gravitational wave detection have proven to be very complicated to control. In order to have sufficient sensitivity to astrophysical gravitational waves, a set of multiple coupled optical cavities comprising the interferometer must be brought into resonance with the laser field. A set of multiinput, multioutput servos then lock these cavities into place via feedback control. This procedure, known as lock acquisition, has proven to be a vexing...
Source: http://arxiv.org/abs/1205.1257v2
10
10.0



by
A. S. Parvan; T. S. Biro
10
0
0
Previous results on Renyi and Wang's formalism of the Tsallis thermostatics are founded by using an extensive variable z connected to the entropic parameter q. It is shown that in the thermodynamical limit both the Tsallis and Renyi entropies are extensive functions of state and the temperature of the system is intensive. In this limit Wang's incomplete nonextensive statistics resembles the Tsallis one, but the Renyi thermostatics is reduced to the usual BoltzmannGibbs one. The principle of...
Source: http://arxiv.org/abs/condmat/0607190v1
When a quantum system undergoes unitary evolution in accordance with a prescribed Hamiltonian, there is a class of states psi> such that, after the passage of a certain time, psi> is transformed into a state orthogonal to itself. The shortest time for which this can occur, for a given system, is called the passage time. We provide an elementary derivation of the passage time, and demonstrate that the known lower bound, due to Fleming, is typically attained, except for special cases in...
Source: http://arxiv.org/abs/quantph/0302067v1
8
8.0



by
S. A. Prosandeev; E. Cockayne; B. P. Burton; S. Kamba; J. Petzelt; Yu. Yuzyuk; R. S. Katiyar; S. B. Vakhrushev
8
0
0
Lattice dynamics for five ordered PMN supercells were calculated from first principles by the frozen phonon method. Maximal symmetries of all supercells are reduced by structural instabilities. Lattice modes corresponding to these instabilities, equilibrium ionic positions, and infrared reflectivity spectra were computed for all supercells. Results are compared with our experimental data for a chemically disordered PMN single crystal.
Source: http://arxiv.org/abs/condmat/0404349v1
11
11



by
Hossein ShokriGhadikolaei; Masoumeh NasiriKenari
11
0
0
Powerful spectrum decision schemes enable cognitive radios (CRs) to find transmission opportunities in spectral resources allocated exclusively to the primary users. One of the key effecting factor on the CR network throughput is the spectrum sensing sequence used by each secondary user. In this paper, secondary users' throughput maximization through finding an appropriate sensing matrix (SM) is investigated. To this end, first the average throughput of the CR network is evaluated for a given...
Source: http://arxiv.org/abs/1111.4624v3
8
8.0



by
M. M. Giannini; E. Santopinto; A. Vassallo
8
0
0
We report on the recent results of the hypercentral Constituent Quark Model (hCQM). The model contains a spin independent threequark interaction which is inspired by Lattice QCD calculations and reproduces the average energy values of the SU(6) multiplets. The splittings within each multiplet are obtained with a SU(6)breaking interaction, which can include also an isospin dependent term. All the 3 and 4stars resonances are well reproduced. Moreover, as all the Constituent Quark models, the...
Source: http://arxiv.org/abs/nuclth/0302019v1
15
15



by
A. Lobel; J. Aufdenberg; A. K. Dupree; R. L. Kurucz; R. P. Stefanik; G. Torres
15
0
0
We present spatially resolved spectra observed with HSTSTIS of the upper chromosphere and dust envelope of Alpha Orionis (M2 Iab). In the fall of 2002 a set of five highresolution nearUV spectra was obtained by scanning at intensity peakup position and four offlimb target positions up to one arcsecond, using a small aperture, to investigate the thermal conditions and flow dynamics in the outer atmosphere of this important nearby cool supergiant star. Based on Mg II h & k, Fe II 2716 A,...
Source: http://arxiv.org/abs/astroph/0312076v1
10
10.0



by
Leo Radzihovsky; Tom Lubensky
10
0
0
Motivated in part by recent experiments on liquid crystals with bentcore molecules, which are observed to display a spontaneous chiral symmetry breaking, we introduce a field theory of a 3rdrank tensor order parameter T^{ijk} to describe the isotropictotetrahedratic phase transition that we predict to take place in these materials. We study the critical properties of the corresponding phase transition and find that this transition, continuous at the meanfield level, is generically driven...
Source: http://arxiv.org/abs/condmat/0008325v1
10
10.0



by
Alejandro M. Lobos; Miguel A. Cazalilla
10
0
0
The phases and excitation spectrum of an easyaxis ferromagnetic chain of S=1/2 magnetic impurities built on the top of a clean metallic surface are studied. As a function of the (Kondo) coupling to the metallic surface and at low temperatures, the spin chain exhibits a quantum phase transition from an Ising ferromagnetic phase with longrange order to a paramagnetic phase where quantum fluctuations destroy the magnetic order. In the paramagnetic phase, the system consists of a chain of...
Source: http://arxiv.org/abs/1210.1195v1
11
11



by
Julio C. Fabris; Paulo L. C. de Oliveira; Davi C. Rodrigues; Ilya L. Shapiro; A. M. VelasquezToribio
11
0
0
The quantum contributions to the gravitational action are relatively easy to calculate in the higher derivative sector of the theory. However, the applications to the postinflationary cosmology and astrophysics require the corrections to the EinsteinHilbert action and to the cosmological constant, and those we can not derive yet in a consistent and safe way. At the same time, if we assume that these quantum terms are covariant and that they have relevant magnitude, their functional form can...
Source: http://arxiv.org/abs/1203.2695v1
3
3.0



by
A. V. Babich; P. V. Vakula; V. V. Pogosov
3
0
0
We suggest a method for the selfconsistent calculations of characteristics of metal films in dielectric environment. Within a modified KohnSham method and stabilized jellium model, the most interesting case of asymmetric metaldielectric sandwiches is considered, for which dielectric media are different from the two sides of the film. As an example, we focus on Na, Al and Pb. We calculate the spectrum, electron work function, and surface energy of polycrystalline and crystalline films placed...
Source: http://arxiv.org/abs/1209.1057v3
We present a local almost everywhere regularity result for a general nonlinear nondiagonal parabolic system, which main part depends on symmetric part of the gradient.
Source: http://arxiv.org/abs/1210.3403v3
9
9.0



by
Francois Richard
9
0
0
Combining the cosmological requirement on dark matter with the recent BNL g2 measurement it is argued that, within the mSUGRA framework, the preferred region for SUSY mass parameters falls well inside the area covered by the future linear colliders under consideration for right handed sleptons and of the 2 lightest neutralinos. The coverage for the lightest chargino and left handed sleptons is also favoured but with smaller confidence.
Source: http://arxiv.org/abs/hepph/0104106v1
16
16



by
Maurizio Grasselli; Giulio Schimperna
16
0
0
We consider a phasefield model where the internal energy depends on the order parameter in a nonlocal way. Therefore, the resulting system consists of the energy balance equation coupled with a nonlinear and nonlocal ODE for the order parameter. Such system has been analyzed by several authors, in particular when the configuration potential is a smooth doublewell function. More recently, in the case of a potential defined on (1,1) and singular at the endpoints, the existence of a...
Source: http://arxiv.org/abs/1110.5824v1
4
4.0



by
Oleg Lunin; Samir D. Mathur
4
0
0
We consider a string wrapped many times around a compact circle in space, and let this string carry a right moving wave which imparts momentum and angular momentum to the string. The angular momentum causes the strands of the `multiwound' string to separate and cover the surface of a torus. We compute the supergravity solution for this string configuration. We map this solution by dualities to the D1D5 system with angular momentum that has been recently studied. We discuss how constructing...
Source: http://arxiv.org/abs/hepth/0105136v4
5
5.0



by
TsungWei Chen; GuangYu Guo
5
0
0
We investigate torque and also conventionally defined spinHall currents in twodimensional (2D) spinorbit coupled systems of spin1/2 particles within the linear response Kubo formalism. We obtain some interesting relations between the conventional and torque spinHall conductivities for the generic effective Hamiltonian $H_0=\epsilon_k^0+A(k)\sigma_xB(k)\sigma_y$, where $A(k)=\eta^A_ik_i+\eta^A_{ij}k_ik_j+\eta^A_{ijl}k_ik_jk_l+...$,...
Source: http://arxiv.org/abs/0808.3625v2
Solutions of boundary value problems for a diffusion equation of fractional and variable order in differential and difference settings are studied. It is shown that the method of energy inequalities is applicable to obtaining a priori estimates for these problems exactly as in the classical case. The credibility of the obtained results is verified by performing numerical calculations for a test problem.
Source: http://arxiv.org/abs/1105.2033v2
Given $p$ points in a bounded domain of $\R^d$, with $d=2,3$, we show the existence of solutions of the $L^2$critical focusing nonlinear Schr\"odinger equation blowing up exactly in these points.
Source: http://arxiv.org/abs/1004.1905v3
A new method for estimating the angular power spectrum C_l from cosmic microwave background (CMB) maps is presented, which has the following desirable properties: (1) It is unbeatable in the sense that no other method can measure C_l with smaller error bars. (2) It is quadratic, which makes the statistical properties of the measurements easy to compute and use for estimation of cosmological parameters. (3) It is computationally faster than rival highprecision methods such as the nonlinear...
Source: http://arxiv.org/abs/astroph/9611174v2
8
8.0



by
Arkady Vainshtein
8
0
0
I comment on possible relations of Gribov's ideas on mechanism of confinement with some phenomena in QCD and in supersymmetric gauge theories.
Source: http://arxiv.org/abs/hepph/0106200v1
6
6.0



by
Manjari Bagchi; Angela Cortes Nieves; Maura McLaughlin
6
0
0
A number of different classes of potentially extraterrestrial bursts of radio emission have been observed in surveys with the Parkes 64m radio telescope, including "Rotating Radio Transients", the "Lorimer burst" and "perytons". Rotating Radio Transients are radio pulsars which are best detectable in singlepulse searches. The Lorimer burst is a highly dispersed isolated radio burst with properties suggestive of extragalactic origin. Perytons share the...
Source: http://arxiv.org/abs/1207.2992v2